The Shure MX391/C Microflex Cardioid Boundary Microphone is a low-profile wired condenser microphone designed to sit flat on tables, podiums, or altars. It costs around $250 to $277, features a cardioid pickup pattern to isolate speech, and includes a 12-foot cable with an inline preamp.

• Cardioid Polar Pattern: Focuses on the person speaking in front of the mic while cutting out background room noise and feedback.
• Interchangeable Capsules: Allows you to swap the cardioid capsule for supercardioid or omnidirectional options if your needs change.
• Low-Profile Design: Sits flat and unobtrusive on conference tables, lecterns, or stages.
• Inline Preamplifier: Connects via a 12-foot (4-meter) cable to a separate inline preamp with an XLR output, requiring standard 11–52V phantom power.
• RF Filtering: Built to block unwanted radio interference from phones and wireless devices.

Best Uses

• Boardrooms and corporate meeting spaces
• Video conferencing and courtrooms
• Houses of worship and altars
• Educational lecterns and distance learning centers